Apparatus for the casting of melted metals under pressure



May 8, 1928. 1,669,323

E. BRUMM,

APPARATUS FOR THE CASTING OF MELTED METALS UNDER PRESSURE Filed Oct. 10. 1924 5 Shee'ts-Shee't 1 Fiji I KL, L Mr a "I a G J 1- J J I May 8, 1928.

E. BRUMM APPARATUS FOR THE CASTING 0F MELTED METALS UNDER PRESSURE Filed Oct. 10, 1924' 5 Sheets-She et 2 HHHI MWI in Mn N H @HHH WIN 7 Ma s, 192s. 1,669,323

' E. BRUMM APPARATUS FOR-THE CASTING 0F MELTED METALS UNDER PRESSURE Filed Oct. 10, 1924 5 Sheets-Sheet s May s, 1928. 1,669,323

E. BRUMM v APPARATUS FOR THE CASTING 0E. MELTED METALS UNDER PRESSURE Filed Oct. 10. 1924 5 She ets-Sheet 4 May 8, 1928.

E. BRUMM APPARATUS FOR THE CASTING 0F MELTED METALS UNDER PRESSURE Filed Oct. 10, 1924 5 Sheets-Sheet 5 Patented May 8, 1928:

QPATENT orrlcs.

mm BBUMH, OI LYON, IRANCI .arrm'ros ron. 'rnn Application filed October 10, 1924, Serial 10,742,843,

The present invention relates to a casting device whereby metals in fusion can be cast in moulds of special composition, either metallic or variously constructed, in such a manner that the metal is placed in a mould from which the exhausted, the hollow portions of the said mould being exactly filled with the metal so as to produce the desired castings, and 10 that before the casting has become entirely solidified, the metal may be subjected to a suitable com ression by means of a compressed gas, t e latter being preferably neutral in order to obviate as far as possible the oxidation-of the metal during t e casting operation and to impart the maximum homogeneity to the metal.

The following description, 'with reference to the'appended drawings, sets forth an emlbodiment of the invention.

The two halves A of the said mould are well matched at the joints and are adjusted with great care in order to secure the maximum fluid tightness and to enable the production of a certain vacuum as well as the elimination of all leakage of the melted metal at the joints. Y

In order to provide for the accurate matching of the constituent parts of the mould, the lower surface of the said parts is .made erfectly plane and is placed in contact w1th a well-surfaced plate 3 provided with aplurality of studs 0, the various tere on the middle plane; these latter portions comprise at the front part a projection E co-operating with the pressure plate D, thesame being maintained by means of a casrma or Human un'rnns ummn.

air has been preliminarily,

,1 and 1 are elevational views, with oertam parts in section, of the casting deviceortions of the mould being thus con-- swam.

and in France In 1, 1984.

quick-acting handle F by which the said parts are pressed together. Suitable clamping straps, not shown, are dis osed upon the several parts of the mould whereby the latter are pressed together in an efficient manner.

In order to obtain portions in hollow relief in the cast pieces, the apparatus comprises the cores G co-operating with suitable recesses which are formed in each part of so the said mould; the said cores are supported by an extracting element H in such manner that when the cast piece has become solid, all the cores may be removed from the mould at the same time by simply operat- 5 in the lever I.

pon the middle face of the joint of one of the members constituting the mould A is provided a series of ducts J which communicate with the upper parts of the relief portions representing the casting; said ducts have a very small cross section, of about 0.1 mm.; and the series of ducts communicates with the apertures K which in turn communicate with an aitmospheric outlet conduit which is shown in dotted lines at L, the latter having a connection L' which is connectedto a vacuum gump and whichby means of a supply evice operated at the proper time-permits of producing a 30 vacuum in the said mould as soon as the metal begins to flow therein.

For the casting operation, one utilizes suitable filling ladles in order to employ onl the exact amount of metal to completely 11 the reliefs corresponding to the casting, as well as the supply conduits M and also a portion of the supply conduit 0 formed 1n the mould, as far as the level 0 0.

The orifice of the supply conduit M employed for the casting o ieration has a small diameter which is suita ly calculated with reference to the large diameter of the main su fply conduit 0. 4 he upper part of the conduit- 0 com- 5 prises a seating S co-operating with a member forming a fluidtightjoint to ether with the packin R which consists o a semi-refractory su stance (asbestos or the like) the same being controlled by the lever T which effects the vertical motion of the slide U movable upon a vertical rod V which is slotted in order to hold the said slide against rotation when on the ascent or descent. I

The lever '1 is pivoted to a horizontal axis secured to, the device Q, so that when the said lever attains the lower end of the stroke and the packing memberR is brought upon the seating S of the mould, a V rojection upon the lever T will be engaged elow the toe of a member Wjwhich is secured to the base B; by a continued effort upon the said lever, the device Q is caused to bear in a fluldtight manner upon the seating S of the mould A. H

In these conditions, the device Q comprises internal conduits which are connected flexible hose with a conduit for the sup- %y of a compressed neutral gas. The slide is provided with a spring-mounted de vice X which at the end of the stroke is caused to bear, by an adjustable arm Y, upon the handle 'Z of a supply device which opens the conduit of the said compressed s. The said arrangement provides for the casting of metal objects under pressure and in a neutral atmosphere, the operation being performed as follows: 1

1 The metal is rapidly poured into the orifice of the conduit 0 (the device U being removed) and as soon as the metal begins to'fill the bottom of the conduit 0, the operator opens the vacuum su ply pipe, and under t e sole action of tile atmospheric pressure and of the vacuum in the mould, the melted metal will fill up the relief parts of the mould in a satisfactory manner.

After this operation is performed, one insmall ducts-J, and in virtue .of the extremely small section of the said ducts, the metal Is at once solidified, thus closing the outlet of the vacuumandpreventing all discharge of the metal from this portlon of the mould.

The metal also becomes solidified, as above stated upon the outer surface of the suppl condults M of each object to be obtainedi so that during the first period of the casting which is of a very short duration, .there will be formed an outer shell representing the surface ortion of thecast ob ect and of the supply ucts M.

At this time the pressure of the neutral access:

. \l gas is applied upon the surface of the metal which has remained in the liquid state at the lower art of the conduit 0 by reason of the conslderable mass of metal therein.

In virtue of the differential nature of the cross sections of the conduits M (sections d) and the cross section of the lower art of the conduit 0 (section al there will e produced at this time an e ect comparable to what takes place in a hydraulic press, thus producing within the already solidified metal shell in the conduits and the mould, a pressure which is amplified with respect to -the pressure of said neutral gas at the inlet 0, 1n the inverse ratio to the cross sections d and (P. So that the said pressure will be transmitted in a uniform manner, since the transmitting element is a liquid mass- (melted metal) and it forces the still malleable metal shell of the solidified metal into exact contact with the walls of the mould, by this action which resembles that of forg- 1n lhe solidification of the supply ducts and of the small feeding head in the "conduit 0 will rapidl follow the solidification which produced the said shell. At this moment, the slide U is raised at the same time that the cores G are removed from the mould by means of the device H. a

By operating-the handle F the mould 1s disengaged from the pressure plate D, and the two portions of the mould can be sepa-' rated after releasing the devices employed for clamping the joints, should such be pro- R vided. After the variousparts of the mould have been opened, the castings may be removed, and the operations are recommenced.

Obviously, the said mould may be made of any suitable metal or other substance capable of withstanding the temperature" of the metal employed.

- What I claim is:

1. A casting machine of the type de-,

scribed, comprlsing a separable metallic 11o mold, a lurality of cores projecting into said mold means to remove said cores simultaneousl from said mold, a vacuum pipe, a plurahty of ducts connecting said vacuum pipe with the interior of said mold, a gas 116 Inlet pipe for said mold and means for supply' g said inlet pipe with an inert gas under pressure.

,2. A casting machine of the type demetallic 120 scribed, comprising a separable I mold, a lurality of cores projecting into said mold? means to remove said cores simultaneously from said mold, a vacuum pipe, a plurality of ducts connecting, saidvacuum pipe with the interior of sald mold, a as 126 inlet pi e for said mold, means for sup ving sai inlet pipe with an inert as under pressure and means including a slldable elementAfor closing the inlet to said mold.

casting machine of the type. dem scribed, comprisin a separable metallic have been closed by the entrance and freez mold having a mo ding cavity, ducts coninlpf the metal therein. nected to said cavity to rapidly freeze metal testimon that I claim the foregoing l0 entering-them and close the ducts, meansto as my inventlon, I have signed my name 6 exhaust the ducts and therethrough the cavhereto.

ity and means to apply auxiliary as ressure to the casting metal after t e ucts EMILE BRUMM. 

